Rangimarie Hunia was appointed an alternate director of Te Ohu Kaimoana at the beginning of 2015 before being appointed a full director in November 2015. In 2017 she was appointed a Chair of Te Pūtea Whakatupu Trust.
In 2016, she was appointed Chief Executive of Ngāti Whātua Ōrakei social development company, Whai Maia. Whai Maia is responsible for the well-being of its 2600 tribal members and focuses on education, health, employment and environmental areas.
She played an active role as a member of the Iwi Working Group that was established to facilitate understanding and iwi decision making in response to the 11-year Review of Māori Fisheries Settlement entities. Rangimarie is also a member of Global Women and was a finalist in the Westpac Women of Influence Awards 2014.